Furnace inspection-door.



No. 676,607. Patented lune l8, l90l.

W. M. GREEN & J. R. GENT.

FURNACE INSPECTION DOOR. (No Model.) (Application filed 001;.17, 1900. 2 Sheets8heet l.

W Q Ir Z/fifzwnan I! ifwmz @MZZM iZi g/zfjwez No. 676,607. Patented June 18, l90l. W. M. GREEN &. J. R. GENT. FURNACE INSPECTION DOOR.

(Application filed Oct. 17, 1900. 2 sheets sheet 2.

(No Nodal.)

W J7 7; 6y i I 0 m 1 wow? zezifllariwyu UNITED STATES PATENT OFFICE.

WILLIAM M. GREEN, OF EVANSTON, AND JOHN R. GENT, OF CHICAGO, ILLI- NOIS, ASSIGNORS TO JOSEPH F. GENT, OF INDIANAPOLIS, INDIANA.

FURNACE INSPECTION-DOOR.

SPECIFICATION forming part of Letters Patent N 0. 676,607, dated June 18, 1901.

- Application filed October 17, 1900- Serial No. 33,354. (No model.)

To all whom it may concern.-

Be it known that we, WILLIAM M. GREEN, a resident of Evanston, and JOHN R. GENT, a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Furnace Inspection-Doors; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in inspection-doors for that class of boiler-furnaces which are provided with automatic stoking devices.

The invention consists in the matters hereinafter set forth, and pointed out in the accompanying claims.

In the drawings, Figure 1 is a view in longitudinal section of an inspection-door of the class above noted. Fig. 2 is a front elevation of the door. Fig. 3 is a central vertical section through the door.

Referring to the drawings, E is an opening inthemasonryofafurnace-wall. Thiswallis reducedin thickness and cut away obliquely, as shown at e e, to give a wide field of vision within the furnace. B is a door-frame set in said opening and held therein by wing-plates A A. These wing-plates are fastened to the masonry in a manner to be detailed hereinafter. 0 is a door suitably hinged by pivotpins 0 c to said door-frame and secured when closed by a latch c of usual construction. Said door has the usual observation-aperture a centrally located therein, with a cover or closure 0 Said closure consists of a fiat plate pivoted above the aperture on the stud '0", so as to cover and close said aperture when said plate is in its normal position.

F is a flat plate or lintel resting on the up per edges of the wing-plates A A and is designed to carry the masonry over the dooropening.

In introducing a door for the purpose indicated into the masonry wall of a furnace the necessary cutting away of the masonry on lines oblique to the face of the wall in order that the angle of vision into the furnace may be as wide as possible reduces the thickness means.

of the masonry adjacent to the door-frame, so that the masonry is liable to become afiected and weakened structurally by the heat. The holding of the door-frame solidly in place therefore is a matter of difiiculty.

The position of the door in the furnace ex-' poses it at times to high temperatures, and it is desirable to have refractory linings to cover the metal of the door which can be easily and quickly replaced as occasion requires.

To securely fasten. the door-frame in the masonry and also provide means for keeping the door protected from the heat, certain special features of construction are provided, which will now be pointed out.

A is a wing-plate whose main portion or face-plate a extends along the oblique outer face of the opening E. From the outer edge of said face-plate a a lateral flangeextends over the masonry wall, where it is of full or unimpaired thickness, a sufficient distance so as to give a good holding ground for anchor-bolts. Said anchor-bolts a aextend from anchor-plates on the interior face of the ma sonry through the flange a of said wing-plate A, so that the latter is firmly clamped to the wall. To further prevent displacement, hori zontal fins or webs a extend from the rear face of said wing-plate A and are inserted or fitted between the courses of the masonry. From the inner edges of the the face-plate a an inner flange a extends in a plane parallel to the plane of the outer flange a The jambs Z) Z) of the door-frame B are likewise provided with lateral flanges b b at their outer edges.

The outer faces of the flanges a of the wingplates A afford bearingsurfaces against which the flanges b of the door-frame B are secured by bolts or rivets or other suitable Thereby the door-frame is made fast to the masonry Wallat its thick portion, where said masonry is liable to be least affected by the'heat, and is held rigidly and securely in position.

The door comprises a hollow metal body, preferably an integral casting, provided with a lining c of refractory material. Said body is open at itstop and its inner or fire face and has the inner faces of its side and bottom walls 0 undercut to afford interlocking engagement with said lining. The lining c consists of a fire brick or tile, which is held in place by'it's side and bottom edges by said side and bottom walls 0 Said lining is further secured by a top plate cflwhich is removably fastenedover the top or upper edge of said lining to the body of the door.

and quickly changed as necessity requires. The refractory lining is made larger than the opening of the door-frame, so as to overlap I the outer face of said door-frame at all sides of the same, so that no part of the metal of terfi'or of the furnace.

We claim as our inventioning at both itsinner-and outer surfaces at the sides of said aperture, of a door-frame fitting the smaller part of the orifice, Win'g- -piates to the inn-er margin of which the door-frame is secured and which have oblique parts fitting the outer oblique surfaces of the wall and having at their'ou'te'r margins flanges which are parallel with and extend over the outer face of the wall, and-securing means =engag- 1n g sa d flanges and the parts of the wall exterror to said flared portions and Where it is of full thickness.

adapted to lie between the masonry courses of the wall.

3. The combination with a furnace -wall having aninspection-apertureand-made flarmg at rts ou ter face at eithersideof said-aper- The securing devices consist of the depending lugs 0 which overlap the front and end Walls By this method of Z tu re, of a door-frame fitting said aperture and provided on its jambs with lateral outwardlyextending flanges, wing-plates having oblique parts fitting the fiared faces of the wall, and provided on their inner margins with flanges which lap the jamb-fianges and provided also with outer flanges which are parallel with and extend over the outer face of the wall, and securing means engaging said outer flanges on the wing-plates and said wall.

4. An inspection-door for a boiler-furnace comprising a hollow metal body consisting of front, bottom and side walls, and having the inner faces of its sides and bottom walls undercut, a refractory lining detachably inter- V docked at its side and bottom edges with said the door is exposed to the heat from the inside and bottom walls, said undercut-innerfaces of said side and bottomwalls being extended to the inner face of the said li ni so 1. The combination with a furnace -w-all having an inspectionapertureand made fiar- 2 that said -s"-i'de and bottom edges of thelin ing are supported and retained for their full width by said side and bottom walls, and a plate extending over the upper edge of said lining and detach-ably secured 'to said body,

5. The combination with a door-frame, of

an inspection-door fitted to close on said,

frame, said door comprising a hollow metal body consisting of front, "bottom and side walls, and ha-Vin g the inner faces of said side and bottom walls undercut, a refractory li ni ng de tachably engaged throughout its entire thickness at its side and botto-m-edgesby'th'e undercut surfaces of said side and bottom 2. "The combination with a furnace wa l having an inspection-aperture, and flared on 1 its outer face at either side of said aperture, ofadoor-fr-ame fitting the said aperture, and Wing-plates having oblique parts fitting the 1 flared face of the wall, and provided with. outer ii-anges extending over the outer face: of said wail exterior to the fiared faces thereof and also with horizontal webs which extend inwardly from the rear faces thereof and are i her, A. D. 1900.

- WILLIAM JOHN GENT.

Witnesses TAYLOR E. BROWN, CLEMENTs STIcKnEY. 

